[MacPorts] #39056: rust is missing from the PortIndex

[MacPorts]

#39056: rust is missing from the PortIndex
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  Reporter:  jmr@…   |      Owner:  g5pw@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.1.3
Resolution:          |   Keywords:
      Port:  rust    |
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Comment (by jmr@…):

 It's not unset, it's set to the empty string. And it's like that because
 archflags are only supported on Darwin.

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Ticket URL: <https://trac.macports.org/ticket/39056#comment:3>
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